1. 随机获取一些网络图片

示例接口：
https://picsum.photos/200/300
示例代码：

<style>
    .list{
        display: grid;
        grid-template-columns: repeat(5,1fr);
        grid-gap: 10px;
        width: 1200px;
        margin: 10px auto;
    }
</style>
<div class="list">
    <img src="https://picsum.photos/200/300?1">
    <img src="https://picsum.photos/200/300?2">
    <img src="https://picsum.photos/200/300?3">
    <img src="https://picsum.photos/200/300?4">
    <img src="https://picsum.photos/200/300?5">
    <img src="https://picsum.photos/200/300?6">
    <img src="https://picsum.photos/200/300?7">
    <img src="https://picsum.photos/200/300?8">
    <img src="https://picsum.photos/200/300?9">
    <img src="https://picsum.photos/200/300?10">
    <img src="https://picsum.photos/200/300?11">
    <img src="https://picsum.photos/200/300?12">
    <img src="https://picsum.photos/200/300?13">
    <img src="https://picsum.photos/200/300?14">
    <img src="https://picsum.photos/200/300?15">
</div>